package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车的商品是否存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        
        if (list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            //如果已经存在，只需要数量加一
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在，插入一条购物车数据
            //判断该条数据是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            } else {
                //本次添加的是套餐
                Long setmealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> getByShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        return shoppingCartMapper.list(shoppingCart);
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        shoppingCartMapper.delete(shoppingCart);
    }

    /**
     * 删除狗购物车中的一个商品
     * @param shoppingCartDTO
     */
    public void updateShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        Long dishId = shoppingCartDTO.getDishId();
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart cart = list.get(0);
        //先判断要删除的是菜品还是套餐
        if (dishId != null) {
            //要删除的是菜品
            //再判断当前菜品的数量是 1 还是 >1
            if (cart.getNumber() == 1) {
                log.info("删除商品：{}",cart);
                shoppingCartMapper.deleteByDishId(cart);
            } else {
                //如果 >1 就数量减1
                cart.setNumber(cart.getNumber() - 1);
                log.info("商品数量：{}",cart.getNumber());
                shoppingCartMapper.updateNumberById(cart);
            }
        } else {
            //删除的是套餐
            //再判断当前套餐的数量是 1 还是 >1
            if (cart.getNumber() == 1) {
                log.info("删除商品：{}",cart);
                shoppingCartMapper.deleteBySetmealId(cart);
            } else {
                //如果 >1 就数量减1
                cart.setNumber(cart.getNumber() - 1);
                log.info("商品数量：{}",cart.getNumber());
                shoppingCartMapper.updateNumberById(cart);
            }
        }
    }

}
